Liquid boss grille insert



FIG. 1 is a perspective view of a liquid boss grille insert showing our new design;

FIG. 2 is an end elevational view thereof, the opposite end is a mirror image that shown;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a liquid boss grille insert, as shown and described. 